Psychiatric Presentations and Medication Use in Older Adults With Intellectual and Developmental Disabilities

•What is the primary question addressed by this study? This study examines whether there are age-associated differences in psychiatric diagnoses, medications, and service use between older adults and middle-aged adults with intellectual and developmental disabilities.•What is the main finding of this study? Older adults, age 50 and over with intellectual and developmental disabilities, are more likely to take higher numbers of psychiatric medications and have fewer psychiatric diagnoses than younger adults with intellectual and developmental disabilities. Older adults also have fewer psychiatric hospitalizations and emergency department visits than younger adults.•What is the meaning of the finding? Older adults with intellectual and developmental disabilities may benefit from regular reviews of psychiatric medication use to minimize risks of polypharmacy.